Merge pull request #40 from lammpstutorials/improve-tutorial-7

clean tutorial 7

Author: simongravelle

figures/US-density-evolution.png

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+# LAMMPS Tutorial manifest file. This file determines what is downloaded when.
+# comments start with a # as the first character.
+# comments and empty lines are ignored
+##############################################################################
+# 1) input file templates and data files
+# the first file will be automatically loaded
+free-sampling.lmp
+umbrella-sampling.meta
+umbrella-sampling.lmp
+wham
+
+# 2) solution files
+# only downloaded on request
+free-sampling.dat
+free-sampling.lmp
+free-sampling.log
+free-sampling.png
+umbrella-sampling.dat
+umbrella-sampling.lmp
+umbrella-sampling.log
+umbrella-sampling.png
+wham
+umbrella-sampling.meta
+
+# 3) support files
+

figures/US-density.png

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+
+variable sigma equal 3.405
+variable epsilon equal 0.238
+variable U0 equal 1.5*${epsilon}
+variable dlt equal 1.0
+variable x0 equal 10.0
+
+units real
+atom_style atomic
+pair_style lj/cut 3.822
+pair_modify shift yes
+boundary p p p
+